大型电力变压器绕组轴向非线性振动研究

建立了变压器绕组安匝不平衡时轴向非线性振动数学模型 ,计算分析了短路条件下绕组轴向振动位移、振幅、相位随时间的变化规律 ,讨论了轴向预紧力等因素对绕组轴向动态特性的影响。说明保持绕组轴向压紧可以增强绕组的轴向稳定性和对短路的承受力。

AXIAL NONLINEAR VIBRATION OF LARGE POWER TRANSFORMER WINDING

An axial nonlinear vibration mathematical model for transformer windings with unbalanced ampere\|turn is presented. The rules of displacement, amplitude and phase shift of axial vibration of transformer winding, which vary with time, under the condition of short\|circuit are calculated and analyzed. The influence of some factors, such as axial prestress etc., on axial dynamic behaviors of winding is discussed. The results of the study show that, keeping the axial compression can strengthen the axial stability of windings and improve the ability of withstanding the impact caused by short\|circuit current.